Perhaps it was cloned from a strore object. If you have a lot of cc installed via the launcher you may need to play around with the dbc cache files to make them all appear, there's a tutorial around here somewhere for that. Also my arr'd store stuff does show up as store stuff.
I only install store stuff and worlds via the launcher. I convert all other cc to packages. Also, if content is showing up as being installed by the launcher, you'd think the stuff would show up in it. The content being cloned from a store object makes sense for the icon showing up in game, but any ideas of how to track down the offending crap if it's not showing up in the launcher? Is it possible for the cc to have a store icon in game, yet be installed as a package if it's cloned from store content?